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Finding the Fourth Proportional to 129,900.95, 179,197.26 and 78,900.11

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Solution

The fourth proportional to 129,900.95, 179,197.26 and 78,900.11 is: 108,842.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,900.95 : 179,197.26 = 78,900.11 : x
  2. Step 2: Convert to fraction form
    129,900.95/179,197.26 = 78,900.11/x
  3. Step 3: Cross multiply
    129,900.95x = 179,197.26 × 78,900.11
  4. Step 4: Simplify right side
    129,900.95x = 14,138,682,629.71
  5. Step 5: Solve for x
    x = 14,138,682,629.71/129,900.95
  6. Step 6: Final answer
    x = 108,842.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.